A (minor) drop in System Frequency, with trip of Loy Yang A1 at 03:58 on Monday 7th September 2026

We have already written:

 

So in this article we take the AEMO’s 4-second data and present this trace to start a broader sweep of system effects:

2026-09-07-VIC-Frequency-4sec-with-LYA1-trip-03

From the chart we see:

  • that the drop (at 03:58:28) to 49.956Hz would correlate with the trip at Loy Yang A1
  • but it’s nothing major, as well within the Normal Operating Frequency Band…

About the Author

Paul McArdle
Paul was one of the founders of Global-Roam in February 2000. He is currently the CEO of the company and the principal author of WattClarity. Writing for WattClarity has become a natural extension of his work in understanding the electricity market, enabling him to lead the team in developing better software for clients. Before co-founding the company, Paul worked as a Mechanical Engineer for the Queensland Electricity Commission in the early 1990s. He also gained international experience in Japan, the United States, Canada, the UK, and Argentina as part of his ES Cornwall Memorial Scholarship.

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